Function b_extract

third-party/lua-5.2.4/src/lbitlib.c:167–174

static int b_extract (lua_State *L) {
  int w;
  b_uint r = luaL_checkunsigned(L, 1);
  int f = fieldargs(L, 2, &w);
  r = (r >> f) & mask(w);
  lua_pushunsigned(L, r);
  return 1;
}


static int b_replace (lua_State *L) {